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Design a Scalable Notification Service

A notification service is a system responsible for delivering timely and relevant information to users across various channels such as SMS, email, push notifications, and in-app messages.
Example: After a user makes an online purchase, the notification service might send them an email confirming the order, an SMS when the payment is processed, and a push notification when the package is shipped.
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    Lightman Wang
    Reviewer: Lightman WangFounder of JR Academy